spencer



(No Model.)

B. E. SPENCER. JACK FOR HEEL BURNISHING MACHINES.

Patented Jan. 6, 1885.

INVENTOR Q Mrwd l. m: mew

WITNESSES:

M ATTORNEYS N. PETERS, mmmunm m p UNITED STATES EDIVARD E. SPENCER,

PATENT OFFICE.

OF NEIV YORK, N. Y.

JACK FOR HEEL-BURNISHING MACHINES.

SPECIFICATION forming part of Letters Patent No. 310,470, dated January6, 1885.

Application filed October 30, 1884.

- To all whom it may concern:

in jacks of that class which consist of a heelsupport, a clamping-bar,and a cam-lever for actuating the clamping-bar.

Hy improvement consists in the combination, with the heel-support, theclamping-bar, and the cam-lever, of a yielding friction-stop whichserves to retain the cam-lever in its locking position against the jarof the bnrnisher.

In the accompanying drawings, Figure 1 is a sectional side elevation ofa jack provided with my friction-stop. Fig. 2 is a transverse section inthe plane a." x, Figs. 1 and 3. Fig. 3 is a horizontal section in theplane 3 9 Fig. 2.

Similar letters indicate corresponding parts.

In the drawings, the letter A designates the heel-support of a jack,such as is in common use in heel-burnishing machines known as Tapleysheel-burnishers. Bis the clamping-bar, which is exposed to the action ofa spring, 0, that has a tendency to throw the clamping'bar back. Dis thecam-lever, which serves to move the clamping-bar forward, so that thesame acts upon the heel and presses the same firmly up against theheelsupport A. The lever D has its fulcrum on a pivot, a, which has itshearings in lugs b, secured to or cast on an arm, 0, extending from theheel-support. The cam portion (1 of the lever D is'made in the form of asegment, and it extends through a slot, 0, in the clan'iping-bar. Bymoving the lever up to the position shown in the drawings theclamping-bar is moved forward so as to clamp the heel; but when themachine is in operation the jar produced by the burnisher isliable tocause the lever to sink down in the direction of arrow 1, Fig. 2, andthe heel becomes loose.

(No model.)

7', which formsthe bearing for the clampingbar B, and round it is wounda spring, 70, the tension of which can be regulated by a nut, Z, fittedon the outer end of the pin 1'. The head of the button f is faced withleather or other equivalent material, and by the action of the spring 70this head is depressed upon the convex surface of the cam (Z. Byadjusting the tension of the spring k the pressure exerted by the buttonf upon the convex surface of the cam d can be so regulated that thecam-lever D is securely retained in its locking position. The pressureof the button f is yielding, so that by applying sufficient force thecam-lever can be moved from its locking position to its unlockingposition, and vice versa, without compelling the person tending themachine to raise the button or to perform any motion not required in theordinary bu wishing-machine.

It will be readily seen by any skilled mechanic that the form of theyielding frictionstop can be changed in various ways, and I do not wishto confine myself to the precise form shown in the drawings.

\Vhat I claim as new, and desire to secure by Letters Patent, is-

The combination, with the heel-support A, the clamping-bar I5, and thecamlever D, of a yielding friction-stop adapted to bear against thecam-lever, substantially as described.

In testimony whereof I have hereunto setmy hand and seal in the presenceof two subscribing witnesses.

EDIVARD E. SPENCER. [11. s]

IVitnesses:

-'WM. 0. Boris,

Emvn. F. Fanxrxe.

